JPH0814487B2 - Method and apparatus for measuring wall thickness of flexible cylinder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for measuring a wall thickness of a flexible cylinder and an apparatus therefor, and more specifically, for example, a rubber cylinder used in combination with a damper or the like. The present invention relates to a method and apparatus for measuring the thickness of a flexible cylindrical body, which automatically and accurately measures the thickness of a body to determine whether or not the product is within specifications.

[Prior art]

Generally, a shock absorber or other shock absorbing device is used for a vehicle suspension device, and one such shock absorbing device is, for example, one shown in FIG.

In this shock absorber, one end of a cylindrical rubber cylindrical body 2 is caulked and fixed to a top end outer peripheral surface of a damper 1 by a stopper 3, and the other end side outer periphery of the rubber cylindrical body 2 is bent in a U shape. The metal fitting 4 is fixed to the surface via a metal fitting 5.

The metal fitting 4 is fixed to the rod 6 of the damper 1, and a sealed air chamber 7 is formed inside the metal fitting 4.

By the way, the cylindrical rubber cylindrical body 2 as described above is formed in a conical cylindrical shape, the small diameter portion 2a is fixed to the outer peripheral surface of the upper end of the damper 1, and the large diameter portion 2b is the rubber cylindrical body 2 outside. It is fixed to the metal fitting 4 in a state of being folded back.

Therefore, the small diameter portion 2a and the large diameter portion 2b of the rubber cylindrical body 2 are
The accuracy of the wall thickness is required from the viewpoint of assembly workability, and the thickness of the central part can be always moved in the vertical direction. It is said to have a great influence.

Therefore, conventionally, when the cylindrical rubber cylinder 2 is manufactured, the accuracy of the wall thickness becomes a serious problem, and the wall thickness is measured even after the manufacturing.

As a conventional method for measuring a cylindrical body, for example, at the end of a U-shaped jig, a receiving part and a micrometer are attached so as to face each other.
Insert the DUT between them and operate the micrometer to set the required position and at least 1 manually according to the circumference division.
More than 20 points were measured per book.

Therefore, in terms of measurement accuracy, the receiving part and the micrometer cannot be handled independently for measurement, and it is difficult to perform accurate measurement.

[Object of the Invention]

The present invention has been devised by focusing on such a conventional problem, and its object is to automatically measure the wall thickness of a flexible cylindrical body without human intervention, and The present invention provides a method and a device for measuring the thickness of a flexible cylindrical body, which enables accurate measurement and improved workability.

[Structure of Invention]

In order to achieve the above-mentioned object, the present invention is a method for measuring the wall thickness of a flexible cylinder body, which measures and inspects the wall thickness of a flexible cylinder body formed in a tapered cylinder shape at a predetermined length at multiple points. First, a zero point deviation at each measurement point of a cylindrical jig formed in a tapered shape is measured by a measuring means and stored in a control device, and then the flexible cylindrical body is rotated through a turning mechanism. Attach it by fitting it to a possible tapered cylindrical jig, and measure the wall thickness by advancing multiple measuring means arranged around the cylindrical jig to multiple locations on the outer peripheral surface of this flexible cylindrical body. The value of the deviation of 0 point is subtracted and corrected while corresponding to the measured value of the outer peripheral surface of each cylindrical jig measured in advance, and data is processed by using this as a true value, and the measured outer peripheral surface of the cylindrical jig is measured. Flexibility is obtained by comparing and calculating the subtraction correction value of the measured value and the upper and lower limit setting values. Since the thickness of the plurality of positions of the cylinder can be determined whether or not to enter the set value, it is an Abstract that accurately measures without as conventional human intervention.

Further, the present invention is a wall thickness measuring device for a flexible cylinder, which measures and inspects the wall thickness of a flexible cylinder formed in a tapered cylinder shape with a predetermined length at multiple points. A tapered cylindrical jig for fitting and mounting a cylindrical body is rotatably erected via a swivel mechanism, and a slide base that can approach and separate is provided on the outer periphery of the cylindrical jig. The slide base is provided with a plurality of measuring means that can come into contact with a plurality of positions on the outer peripheral surface of the flexible cylindrical body and that can be moved and adjusted in the longitudinal direction of the cylindrical jig. Since it is configured by connecting to the control device that performs the correction calculation of the measured measurement value for the jig and the comparison with the preset upper and lower limit setting values, it is not necessary to perform the measurement work manually, thus improving the workability. In addition to being able to perform Is possible, it is an summary that can be manufactured at low cost because it does not use a more complex mechanism.

Example of Invention

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a front view of a wall thickness measuring device for measuring a wall thickness t of a flexible cylindrical body W such as a rubber cylindrical body used in combination with a vehicle damper or the like. Is a cylindrical jig 10 to which a flexible cylindrical body W having a tapered cylindrical shape is fitted and attached as shown in FIGS. 1 to 3, and the cylindrical jig 10. A swivel mechanism 11 that rotatably supports, a slide base 12 that can be moved toward and away from the outer circumference of the cylindrical jig 10, and a plurality of slide bases 12 that are brought into contact with a plurality of locations on the outer peripheral surface of the flexible cylindrical body. Measuring means 13
And a control device 14 connected to each of the measuring means 13, the control device 14, the measurement value measured by the measuring means 13 and the jig correction value measured only by the initial jig, It is determined whether or not the wall thicknesses t of the flexible cylindrical body W at several places are within the set values by performing a comparison calculation with the set upper and lower limit set values.

The cylindrical jig 10 is formed to have a diameter (0.5 mm to 2 mm) slightly smaller than the inner diameter of the flexible cylindrical body W.
A support rod (17) standing on a center jig (16) incorporated in (15) is inserted and its upper end is fixed by a nut (18).

The turning mechanism 11 is provided with a worm wheel 20 for turning the turning table 15 inside a circular table 19, and a worm gear 23 provided on a drive shaft 22 of a motor 21 meshes with the worm wheel 20. The cylindrical jig 10 is configured to rotate at a predetermined speed.

At several locations on the outer circumference of the cylindrical jig 10 (two locations facing each other in this embodiment), with respect to the axis of the cylindrical jig 10,
A measuring device slide device 100 is provided that can approach and separate freely.

This measuring means slide device 100 is configured as follows. The slide base 12, which can be moved toward and away from the cylindrical jig 10, is mounted on a support plate 24, and a slide shaft 26 supported by a block bearing 25 supports a slide bearing.
This slide base 12 is slidably supported via 27
Is connected to the tip of a rod 29 of an air cylinder 28 with a position sensor fixed to the side portion of the support plate 24 via a connecting rod 30.

Height adjusting rails 31 are arranged in the vertical direction on the side surface of the slide base 12, and the linear gauges are provided at several positions (two positions on the left side and three positions on the right side in FIG. 1) of the height adjusting rails 31. A measuring means 13 such as is attached.

The measuring means 13 is attached to the tip of a plate 32 via a lock bolt 33 so that the angle can be adjusted, and the plate 32 is attached to the height adjusting rail 31 via a lock bolt 34 so that the position of the plate 32 can be adjusted.

A rod-shaped detector 13a is attached to the tip of the measuring means 13 so as to extend and contract.

Each measuring means 13 has a control circuit 35 as shown in FIG.
It is connected to the control device 14 via.

In the control circuit 35, each measuring means 13 is connected with a counter 36 for measuring a detection value, and each counter 36 is a control device.
The measured value is output to 14.

The electric output of the value measured by each measuring means 13 is input to the control device 14 via the counter 36, and performs measurement calculation storage and data processing.

Note that FIG. 4 is a schematic view of the measuring apparatus of FIG. 1, each mechanism is shown diagrammatically, and the reference numerals in FIG. 1 indicate the same components.

 Next, a method of measuring the wall thickness will be described.

First, at each measurement point of the cylindrical jig 10 (for example, four points A, B, C, D, and E in FIG. 4 on the circumference, that is, 90-degree intervals), The deviation is measured by the measuring means 13 and stored in the control device 14.

Next, the flexible cylindrical body W is fitted and attached to the rotatable cylindrical jig 10 via the turning mechanism 11,
At a plurality of points A, B, C, D, and E on the outer peripheral surface of 10, a plurality of measuring means 13 arranged around the cylindrical jig 10 are moved forward through the air cylinder 28 to obtain 5 points. Measure the wall thickness of. Then, next, the swiveling mechanism 11 swivels every 90 degrees, and the same measurement is performed four times in total, and 20 points are performed in total.

Then, this measured value is input to the control device 14, and the value of the deviation of 0 point is subtracted and corrected while corresponding to the measured value of the outer peripheral surface of each cylindrical jig measured in advance, and this is processed as a true value for data processing.

Further, by performing comparison calculation processing with the upper and lower limit set values input in advance, it is determined whether or not the wall thicknesses t of the flexible cylindrical body W at a plurality of positions are within the set values.

The required accuracy of the wall thickness t of the flexible cylindrical body W can be measured by the above-mentioned device to 10 μm or less.

〔The invention's effect〕

According to the present invention, as described above, first, the zero point deviation at each measurement point of the cylindrical jig is measured by the measuring means and stored in the control device, and then the flexible cylindrical body is passed through the turning mechanism. It is fitted and attached to a rotatable cylindrical jig, and at multiple points on the outer peripheral surface of this flexible cylindrical body,
The wall thickness is measured by advancing a plurality of measuring means arranged around the cylindrical jig, and the deviation value of 0 point is subtracted and corrected while corresponding to the measured value of the outer peripheral surface of each cylindrical jig in advance. At the same time, data processing is performed using this as a true value, and the subtraction correction value of the previously measured measurement value of the outer peripheral surface of the cylindrical jig and the upper and lower limit setting values are compared and calculated, whereby a rubber formed in a tapered cylindrical shape is formed. Since it is possible to automatically determine whether or not the wall thicknesses of flexible cylinders at multiple locations fall within the set values, the effect of being able to perform accurate measurements without the need for human intervention as in the conventional case is there.

Further, a tapered cylindrical jig to which a flexible cylindrical body is fitted and attached is rotatably erected via a swivel mechanism, and a slide base which can be moved toward and away from the outer circumference of the cylindrical jig. The slide base is provided with a plurality of measuring means that can come into contact with a plurality of locations on the outer peripheral surface of the flexible cylindrical body and that can be moved and adjusted in the longitudinal direction of the cylindrical jig. Since it is configured to be connected to the control device that performs the correction calculation for the jig value of the measurement value measured by the measuring means and the comparison calculation with the preset upper and lower limit set values, it is not necessary to manually perform the measurement work. The workability can be improved, the measurement time can be shortened, and there is an effect that the manufacturing cost can be reduced because a complicated mechanism is not used.

[Brief description of drawings]

FIG. 1 is a front view of a wall thickness measuring apparatus embodying the present invention, FIG. 2 is a plan view taken along the line II-II of FIG. 1, and FIG. 3 is an operation state diagram of the measuring means of FIG. The figure is an illustration of the control circuit, fifth
The figure is an explanatory view showing a usage state of the flexible cylindrical body. 10 ... Cylindrical jig, 11 ... Swivel mechanism, 12 ... Slide base, 13 ... Measuring means, 14 ... Control device, W ... Flexible cylinder, t ... Thickness.

Claims (2)

[Claims] 1. A method for measuring the wall thickness of a flexible cylinder, which has a predetermined length and is formed into a tapered cylinder shape, at multiple points by measuring and inspecting the wall thickness. The zero point deviation at each measurement point of the cylindrical jig formed in the above is measured by the measuring means and stored in the control device, and then the flexible cylindrical body is formed into a taper shape rotatable through a turning mechanism. The measurement is carried out in advance by measuring the wall thickness by advancing a plurality of measuring means arranged around the cylindrical jig to a plurality of positions on the outer peripheral surface of the flexible cylindrical body by fitting the cylindrical jig onto the cylindrical jig. The offset value of 0 point is subtracted and corrected in correspondence with the measured value of the outer peripheral surface of the cylindrical jig, and this value is processed as a true value to perform subtraction correction of the measured value of the outer peripheral surface of the cylindrical jig previously measured. By comparing and calculating the value and the upper and lower limit set values, the meat at multiple locations on the flexible cylinder A method for measuring the wall thickness of a flexible cylinder, comprising determining whether or not the thickness is within a set value. 2. A wall thickness measuring device for a flexible cylinder, which measures and inspects the wall thickness of a flexible cylinder formed into a tapered cylinder shape with a predetermined length at multiple points. A cylindrical jig formed by fitting and mounting a cylindrical body is erected rotatably via a turning mechanism,
A slide base that can be moved closer to and away from the outer circumference of the cylindrical jig is provided, and the slide base can be brought into contact with a plurality of locations on the outer peripheral surface of the flexible cylindrical body and can be moved in the longitudinal direction of the cylindrical jig. A plurality of possible measuring means are provided, and each measuring means is connected to a control device that performs a jig-correction calculation of the measured value measured by the measuring means and a comparison calculation with preset upper and lower limit set values. A thickness measuring device for a flexible cylinder characterized by being configured.